t-muldiv.c
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上传日期:2022-08-06
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- /* Test mpf_mul, mpf_div, mpf_ui_div, and mpf_div_ui.
- Copyright 1996, 2000, 2001, 2003 Free Software Foundation, Inc.
- This file is part of the GNU MP Library.
- The GNU MP Library is free software; you can redistribute it and/or modify
- it under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 3 of the License, or (at your
- option) any later version.
- The GNU MP Library is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
- License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
- #include <stdio.h>
- #include <stdlib.h>
- #include "gmp.h"
- #include "gmp-impl.h"
- #include "tests.h"
- #ifndef SIZE
- #define SIZE 16
- #endif
- int
- main (int argc, char **argv)
- {
- mp_size_t size;
- mp_exp_t exp;
- int reps = 10000;
- int i;
- mpf_t u, v, w, x;
- mp_size_t bprec = SIZE * GMP_LIMB_BITS;
- mpf_t rerr, limit_rerr;
- unsigned long ulimb, vlimb;
- int single_flag;
- tests_start ();
- if (argc > 1)
- {
- reps = strtol (argv[1], 0, 0);
- if (argc > 2)
- bprec = strtol (argv[2], 0, 0);
- }
- mpf_set_default_prec (bprec);
- mpf_init (rerr);
- mpf_init (limit_rerr);
- mpf_init (u);
- mpf_init (v);
- mpf_init (w);
- mpf_init (x);
- for (i = 0; i < reps; i++)
- {
- mp_size_t res_prec;
- res_prec = urandom () % bprec + 1;
- mpf_set_prec (w, res_prec);
- mpf_set_prec (x, res_prec);
- mpf_set_ui (limit_rerr, 1);
- mpf_div_2exp (limit_rerr, limit_rerr, res_prec - 1);
- single_flag = 0;
- if ((urandom () & 1) != 0)
- {
- size = urandom () % (2 * SIZE) - SIZE;
- exp = urandom () % SIZE;
- mpf_random2 (u, size, exp);
- }
- else
- {
- ulimb = urandom ();
- mpf_set_ui (u, ulimb);
- single_flag = 1;
- }
- if ((urandom () & 1) != 0)
- {
- size = urandom () % (2 * SIZE) - SIZE;
- exp = urandom () % SIZE;
- mpf_random2 (v, size, exp);
- }
- else
- {
- vlimb = urandom ();
- mpf_set_ui (v, vlimb);
- single_flag = 2;
- }
- if (mpf_sgn (v) == 0)
- continue;
- mpf_div (w, u, v);
- mpf_mul (x, w, v);
- mpf_reldiff (rerr, u, x);
- if (mpf_cmp (rerr, limit_rerr) > 0)
- {
- printf ("ERROR in mpf_mul or mpf_div after %d testsn", i);
- printf (" u = "); mpf_dump (u);
- printf (" v = "); mpf_dump (v);
- printf (" x = "); mpf_dump (x);
- printf (" w = "); mpf_dump (w);
- abort ();
- }
- if (single_flag == 2)
- {
- mpf_div_ui (x, u, vlimb);
- mpf_reldiff (rerr, w, x);
- if (mpf_cmp (rerr, limit_rerr) > 0)
- {
- printf ("ERROR in mpf_div or mpf_div_ui after %d testsn", i);
- printf (" u = "); mpf_dump (u);
- printf (" v = "); mpf_dump (v);
- printf (" x = "); mpf_dump (x);
- printf (" w = "); mpf_dump (w);
- abort ();
- }
- }
- if (single_flag == 1)
- {
- mpf_ui_div (x, ulimb, v);
- mpf_reldiff (rerr, w, x);
- if (mpf_cmp (rerr, limit_rerr) > 0)
- {
- printf ("ERROR in mpf_div or mpf_ui_div after %d testsn", i);
- printf (" u = "); mpf_dump (u);
- printf (" v = "); mpf_dump (v);
- printf (" x = "); mpf_dump (x);
- printf (" w = "); mpf_dump (w);
- abort ();
- }
- }
- }
- mpf_clear (rerr);
- mpf_clear (limit_rerr);
- mpf_clear (u);
- mpf_clear (v);
- mpf_clear (w);
- mpf_clear (x);
- tests_end ();
- exit (0);
- }